OIM EBS Connector Upgrade

Question

I am upgrading Oracle EBS (e-Business Suite) connector for OIM (Oracle Identity Manager)

I am going through this case that when I upgrade the EBS connector, I am loosing the previous customizations. For example:

1. Custom process forms are not getting migrated from older version to newer version. Meaning, custom tasks from process form are getting lost and no more visible
2. Custom reconciliation rules are not getting migrated from older version to newer version. Meaning, custom reconciliation rules are getting lost and no more visible

My question in this regard is:

1. Did any one who performed similar upgrade faced this issue ?
2. If similar issue is faced then what is the solution to this ? or what other approach we can take to migrate all old process forms, recon rule etc
3. Can someone suggest if upgrade of EBS connector for OIM is possible at all or clean install is better option (this is the least preferred for us)